Anti-static lyocell fabric and method for manufacturing the same

Abstract

The present application relates to lyocell fabric with anti-static function and its preparation method. First, the wood pulp cellulose is modified by using ferric chloride, sulfosalicylic acid and pyrrole monomer; second, the spinning solution is prepared; third, the spinning solution is added into the screw extruder and enters the spinning system to prepare the lyocell fiber; finally, the lyocell fiber is post-treated and woven to prepare the anti-static lyocell fabric. The point-to-point resistance of the anti-static lyocell fabric prepared by the present application reaches 4.7*10 6 ~5.3*10 6 Ω, the charging amount reaches 0.18~0.21 muC / piece; after 20 times of washing, the point-to-point resistance and the charging amount do not change greatly, which indicates that the lyocell fabric prepared by the present application has stable anti-static function.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fabric preparation, and particularly relates to lyocell fabric with anti-static function and a preparation method thereof. BACKGROUND

[0002] To realize the anti-static function of fabric and clothes, mainly, metal fiber, sub-conductive fiber or anti-static synthetic fiber is used to eliminate the charge of clothes and human body by using the mechanism of corona discharge and leakage discharge. The realization forms are mainly divided into three types of surface finishing type, blending type and interweaving type. The surface finishing type generally uses the method of moisture-absorbing resin finishing on the surface of the fabric and the method of mixing moisture-absorbing material or introducing hydrophilic genes into the fiber to achieve the anti-static effect; the blending type is to mix other fibers into the yarn and fabric by spinning the conductive or sub-conductive short fibers according to the blending ratio, and then to make clothes; and the interweaving type is to weave the conductive fiber filament or short fiber into ordinary filament or ordinary yarn in a certain arrangement. With the rapid development of electronic industry, petrochemical industry, medical and health industries, the requirements for production and working environment will be higher and higher, and the individual protection consciousness will be gradually strengthened. Therefore, the development and application of high-quality, comfortable and cost-effective anti-static fibers, anti-static fabrics and corresponding anti-static clothes and other anti-static textiles have become the goal of textile researchers.

[0003] Lyocell fabric is a high-end fabric, but it does not have anti-static function. If the conventional anti-static function modification idea is used, that is, the anti-static function of the fabric is improved by modifying the fabric, the comfort of the fabric will be negatively affected. SUMMARY

[0004] In view of the defects of the prior art, a first object of the present application is to provide lyocell fabric with anti-static function, which has good anti-static function.

[0005] The lyocell fabric with anti-static function can be prepared by the following method: first, the wood pulp cellulose is modified by using ferric chloride, sulfosalicylic acid and pyrrole monomer; second, a spinning solution is prepared; third, the spinning solution is added to a screw extruder and enters a spinning system to prepare lyocell fiber; and finally, the lyocell fiber is post-treated and woven to prepare anti-static lyocell fabric.

[0006] A second object of the present application is to provide a preparation method of lyocell fabric with anti-static function, which comprises the following steps:

[0007] (1) Wood pulp cellulose modification: under ice bath conditions, wood pulp cellulose, ferric chloride and sulfosalicylic acid aqueous solution are mixed, stirred for 30-40 minutes until the wood pulp cellulose is completely dispersed, then pyrrole monomer is added, the reaction temperature is controlled at 70-80 DEG C to start the reaction, and the mechanical stirring is reacted for 100-120 minutes; after the reaction is completed, filtration is carried out, and the obtained filtrate is washed with tap water until the obtained filtrate is neutral, then the modified wood pulp cellulose is collected and dried for use.

[0008] Preferably, the amount of wood pulp cellulose, ferric chloride, pyrrole and sulfosalicylic acid aqueous solution is 1g:(0.1-0.3)g:(0.1-0.3)mL:(10-20)mL; the concentration of sulfosalicylic acid aqueous solution is 0.1-0.3wt%.

[0009] (2) Preparation of spinning solution: 50-55wt% N-methyl morpholine-N-oxide (NMMO) aqueous solution is distilled under reduced pressure to 90-95wt% NMMO aqueous solution, and the modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and is stirred and dissolved in a reaction kettle at 105-120 DEG C for 30-40 minutes to prepare a 12-18wt% spinning solution.

[0010] (3) Spinning: the spinning solution prepared in step (2) is added to a screw extruder, further dissolved at 95-110 DEG C, then filtered and enters a spinning system to prepare lyocell fiber.

[0011] Preferably, the air gap length of the spinning system is 6-9cm, the spinning speed is 35-50m / min, the spinneret hole diameter is 10-110μm, and the hole capillary length is 300-900μm; the extruded yarn is vertically stretched in the air, enters a coagulation bath tank, coagulates and forms, the coagulation bath concentration is 12-15wt% NMMO aqueous solution, and the coagulation bath temperature is 6-9 DEG C.

[0012] (4) Post-treatment: the lyocell fiber prepared in step (3) is subjected to alcohol washing, water washing, oiling and drying processes to prepare lyocell fiber.

[0013] (5) Weaving: the lyocell fiber prepared in step (4) is spun into yarn, and the yarn is woven into anti-static lyocell fabric.

[0014] The related mechanism analysis of the application: under the action of ferric chloride, pyrrole monomer and wood pulp cellulose occur polymerization and crosslinking, and sulfosalicylic acid acts as a dopant to dope polypyrrole and improve the conductivity of polypyrrole. Wood pulp cellulose grafted with polypyrrole has conductivity, which can be used for anti-static materials.

[0015] Compared with the prior art, the application has the advantages and beneficial effects that:

[0016] (1) The main raw material of the lyocell fabric is wood pulp cellulose, which does not have the electric conductivity; in order to give the lyocell fabric the electric conductivity and the anti-static function, the wood pulp cellulose is grafted with polypyrrole, and the sulfosalicylic acid is selected as the dopant, so that the prepared lyocell fabric has the good anti-static function.

[0017] (2) The lyocell fabric prepared by the method has the stable anti-static function, and the anti-static function is not weakened after multiple water washing.

[0018] (3) According to the test method of GB 12014-2009, the point-to-point resistance of the anti-static lyocell fabric prepared by the method reaches 4.7*10 6 ~ 5.3*10 6 Ω, the charged charge reaches 0.18~0.21 μC / piece, and reaches the A-level or B-level technical standard; after 20 times of washing, the point-to-point resistance and the charged charge do not change greatly, which shows that the lyocell fabric prepared by the method has the stable anti-static function. DETAILED DESCRIPTION

[0019] Example 1

[0020] The lyocell fabric with the anti-static function is prepared by the following method:

[0021] (1) Wood pulp cellulose modification: 10 g of wood pulp cellulose, 2 g of ferric chloride and 150 mL of 0.2 wt% sulfosalicylic acid aqueous solution are mixed under ice bath condition, and stirred for 35 minutes until the wood pulp cellulose is completely dispersed, then 2 mL of pyrrole monomer is added, the reaction temperature is controlled to 75℃, and the mechanical stirring is started to react for 110 minutes; after the reaction is completed, the modified wood pulp cellulose is collected after being filtered and washed with tap water until the obtained filtrate is neutral, and then dried for use.

[0022] (2) Preparation of spinning solution: 53 wt% N-methylmorpholine-N-oxide (NMMO) aqueous solution is distilled under reduced pressure to 93 wt% NMMO aqueous solution, and the modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and stirred and dissolved in a reaction kettle at 115℃ for 35 minutes to prepare a 16 wt% spinning solution.

[0023] (3) Spinning: the spinning solution prepared in step (2) is added to a screw extruder, and further dissolved at 105℃, then filtered and introduced into a spinning system to prepare a lyocell fiber.

[0024] The air gap length of the spinning system is 8 cm, the spinning speed is 45 m / min, the spinneret hole diameter is 80 μm, and the hole capillary length is 600 μm; the sprayed thread is vertically stretched in the air, enters the coagulation bath tank, coagulates and forms, and the coagulation bath concentration is 13 wt% NMMO aqueous solution, and the coagulation bath temperature is 8℃.

[0025] (4) Post-processing: the lyocell fibers prepared in step (3) are subjected to alcohol washing, water washing, oiling and drying processes to obtain lyocell fibers.

[0026] (5) Weaving: the lyocell fibers prepared in step (4) are spun into yarn, and the yarn is woven into an anti-static lyocell fabric a.

[0027] Example 2

[0028] The anti-static lyocell fabric is prepared by the following method:

[0029] (1) Wood pulp cellulose modification: under ice bath conditions, 10 g of wood pulp cellulose, 1 g of ferric chloride and 100 mL of 0.1 wt% sulfosalicylic acid aqueous solution are mixed, stirred for 30 minutes until the wood pulp cellulose is completely dispersed, then 1 mL of pyrrole monomer is added, the reaction temperature is controlled at 70℃, and the mechanical stirring is started for 100 minutes; after the reaction is completed, filtration is performed, and the obtained filtrate is washed with tap water until it is neutral, then the modified wood pulp cellulose is collected and dried for use.

[0030] (2) Preparation of spinning solution: 50 wt% N-methylmorpholine-N-oxide (NMMO) aqueous solution is distilled under reduced pressure to 90 wt% NMMO aqueous solution, and the modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, stirred and dissolved in a reaction kettle at 105℃ for 30 minutes to obtain a 12 wt% spinning solution.

[0031] (3) Spinning: the spinning solution prepared in step (2) is added to a screw extruder, further dissolved at 95℃, then filtered and introduced into a spinning system to obtain lyocell fibers.

[0032] The air gap length of the spinning system is 8 cm, the spinning speed is 45 m / min, the spinneret hole diameter is 80 μm, and the hole capillary length is 600 μm; the sprayed thread is vertically stretched in the air, enters the coagulation bath tank, coagulates and forms, and the coagulation bath concentration is 13 wt% NMMO aqueous solution, and the coagulation bath temperature is 8℃.

[0033] (4) Post-processing: the lyocell fibers prepared in step (3) are subjected to alcohol washing, water washing, oiling and drying processes to obtain lyocell fibers.

[0034] (5) Weaving: the lyocell fibers prepared in step (4) are spun into yarns, and the yarns are woven into the anti-static lyocell fabric b.

[0035] Example 3

[0036] The anti-static lyocell fabric is prepared by the following method:

[0037] (1) Modification of wood pulp cellulose: 10 g of wood pulp cellulose, 3 g of ferric chloride and 3 mL of 0.3 wt% sulfosalicylic acid aqueous solution are mixed under ice bath conditions, and stirred for 40 minutes until the wood pulp cellulose is completely dispersed. Then, 3 mL of pyrrole monomer is added, and the reaction temperature is controlled at 80°C to start the reaction. The reaction is carried out under mechanical stirring for 120 minutes. After the reaction is completed, the modified wood pulp cellulose is collected by filtration, washed with tap water until the obtained filtrate is neutral, and then dried for use.

[0038] (2) Preparation of spinning solution: 55 wt% N-methylmorpholine-N-oxide (NMMO) aqueous solution is distilled under reduced pressure to 95 wt% NMMO aqueous solution. The modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and stirred and dissolved in a reaction kettle at 120°C for 40 minutes to prepare 18 wt% spinning solution.

[0039] (3) Spinning: the spinning solution prepared in step (2) is added to a screw extruder, and further dissolved at 110°C, and then filtered and introduced into a spinning system to prepare lyocell fibers.

[0040] The air gap length of the spinning system is 9 cm, the spinning speed is 50 m / min, the spinneret hole diameter is 110 μm, and the hole capillary length is 900 μm. The spun yarns are vertically stretched in the air, enter a coagulation bath tank, and are coagulated and shaped. The coagulation bath concentration is 15 wt% NMMO aqueous solution, and the coagulation bath temperature is 9°C.

[0041] (4) Post-treatment: the lyocell fibers prepared in step (3) are subjected to alcohol washing, water washing, oiling and drying processes to prepare lyocell fibers.

[0042] (5) Weaving: the lyocell fibers prepared in step (4) are spun into yarns, and the yarns are woven into the anti-static lyocell fabric c.

[0043] Comparative Example A

[0044] In Comparative Example A, the oxidizing agent is changed, i.e. the "ferric chloride" in step (1) is replaced by "hydrogen peroxide", and the other preparation methods are carried out according to the preparation method of Example 1 to prepare anti-static lyocell fabric d.

[0045] Comparative Example B

[0046] Comparative Example B, the reaction temperature was lowered, i.e., the "controlling the reaction temperature to 75°C to start the reaction" in step (1) was adjusted to "controlling the reaction temperature to 35°C to start the reaction", and other preparation methods were implemented according to the preparation method of Example 1 to obtain an antistatic lyocell fabric e.

[0047] Comparative Example C

[0048] Comparative Example C, the concentration of the dopant was lowered, i.e., the "0.2wt% sulfosalicylic acid aqueous solution" in step (1) was adjusted to "0.02wt% sulfosalicylic acid aqueous solution", and other preparation methods were implemented according to the preparation method of Example 1 to obtain an antistatic lyocell fabric f.

[0049] Performance evaluation test:

[0050] The antistatic lyocell fabrics a, b, c, d, e and f prepared by the above specific examples 1-3 and comparative examples A-C in the application were selected. The antistatic function test refers to GB 12014-2009 "Antistatic Clothing", and the point-to-point resistance and the amount of charged charge are used as the antistatic function evaluation index. Among them, the point-to-point resistance refers to the test method of GB 12014-2009 Appendix A, and the amount of charged charge refers to the test method of GB 12014-2009 Appendix B, and the test conditions are: temperature: (20±5)℃, relative humidity: (35±5)%. The test results are shown in Table 1.

[0051] Table 1

[0052]

[0053]

[0054] As can be seen from Table 1, the point-to-point resistance and the amount of charged charge of the antistatic lyocell fabrics a, b, c, d, e and f prepared by Examples 1-3 and Comparative Examples A-C are compared, it can be seen that Examples 1-3 are obviously superior to Comparative Examples A-C in terms of antistatic indicators. The performance evaluation test results show that the type of oxidizing agent, the reduction of reaction temperature and the reduction of dopant concentration all have important influence on the antistatic function of lyocell fabric.

Claims

1. A method for preparing lyocell fabric with anti-static function, characterized in that, The preparation method comprises the following steps: (1) wood pulp cellulose modification: under ice bath conditions, wood pulp cellulose, ferric chloride and sulfosalicylic acid aqueous solution are mixed, stirred for 30-40 minutes until the wood pulp cellulose is completely dispersed, then pyrrole monomer is added, the reaction temperature is controlled at 70-80°C to start the reaction, and the reaction is carried out under mechanical stirring for 100-120 minutes; after the reaction is completed, filtration is carried out, and the obtained filtrate is washed with tap water until the filtrate is neutral, then the modified wood pulp cellulose is collected and dried for use; (2) preparation of spinning solution: 50-55wt% N-methyl morpholine-N-oxide (NMMO) aqueous solution is reduced pressure distilled to 90-95wt% NMMO aqueous solution, the modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and the reaction kettle is stirred and dissolved at 105-120°C for 30-40 minutes to prepare 12-18wt% spinning solution; (3) spinning: the spinning solution prepared in step (2) is added to a screw extruder, further dissolved at 95-110°C, then filtered and introduced into a spinning system to prepare lyocell fiber; (4) post-treatment: the lyocell fiber prepared in step (3) is subjected to alcohol washing, water washing, oiling and drying processes to prepare lyocell fiber; (5) weaving: spinning the lyocell fibers prepared in step (4) into yarn, and weaving the yarn into an anti-static lyocell fabric; the point-to-point resistance of the prepared anti-static lyocell fabric reaches 4.7 x 10 6 ~ 5.3 x 10 6 Ω.

2. The method for preparing the anti-static lyocell fabric according to claim 1, characterized in that, In step (1), the amount ratio of wood pulp cellulose, ferric chloride, pyrrole and sulfosalicylic acid aqueous solution is 1g:(0.1-0.3)g:(0.1-0.3)mL:(10-20)mL; the concentration of sulfosalicylic acid aqueous solution is 0.1-0.3wt%.

3. The method for preparing the anti-static lyocell fabric according to claim 1, characterized in that, In step (3), the air gap length of the spinning system is 6-9cm, the spinning speed is 35-50m / min, the spinneret hole diameter is 10-110μm, and the hole capillary length is 300-900μm; the extruded yarn is vertically stretched in the air, enters the coagulation bath tank, coagulates and forms, the coagulation bath concentration is 12-15wt% NMMO aqueous solution, and the coagulation bath temperature is 6-9°C.

4. Lyocell fabric with antistatic function, characterized in that, Prepared by the method in any one of claims 1-3.

Images